Officer John Nolan is assigned to guide the precinct's new night general detective, Nick Armstrong (played by Harold Perrineau), who handles off-hours major crime scenes.
. Airing on October 6, 2019, the episode introduced pivotal new characters and forced the main cast to grapple with major personal and professional shifts.
While on patrol, they respond to a home invasion that quickly escalates into a complex murder investigation involving a father seeking vigilante revenge for his son's death.